Using this water bottle carrier bag is a breeze. First, slide your 40oz tumbler or water bottle into the main part of the bag. You can adjust the strap to your preferred length and either wear it on your shoulder or across your body. Put your phone, keys, ID cards, and bank cards in the appropriate pockets. When you're in the car, you can place the bag with the tumbler in the car cup holder. As for maintenance, you can spot - clean the bag with a mild detergent and a soft cloth when it gets dirty. Be careful not to expose it to extreme heat or sharp objects. Remember, the color in the preview images might be a bit different from the real item because of lighting during the photoshoot or your monitor settings.